Oil cooling arrangement for air-cooled internal combustion engines



April 18, 1933. r G. c. CAPPA 1,904,407

OIL COOLING ARRANGEMENT FOR AIR COOLED INTERNAL COMBUSTION ENGINES Filed Aug. 22, 1930 Patented Apr. 18,1933

radiation of casing along which I an, in addition to the in the casing of the being connected to For this purpose it 1s advantageous to ro- UNI ED STATES PATENT OFFICE.

ammo cnssnn onrra, or roam, r'rnmr, assrenon or elm-mar 'ro sogm'rA v axonme nurouonnsr or m, 1mm? on. cocaine GEHENT FOR AIB-COQLED AL COMBUSTION ENGINE Application fled August 22, 1980, Serial Ii'c. 477,101, and in Italy August 29, 1829.

It is known that in usual internal combustion engines a considerable part'of the heat is transferred by the cylinder walls and piston heads to the lubricating oil, which tends to reach ve high temperatures capable of objectionai ly a eoting its lubrieating properties; The dispersion and heat from the walls of the engine air flows, particularly during operation, tend to keep the oil temperature within admissible unobjectionable limits.

The amount of heat transferred to the lubricating oil is, however, a considerably larger one in air cooled engines since the temperatureof the cylinder and piston walls is in this case substantially higher. than in watercooled engines.

Conse uently, the casing surface is not always su cient to abstract the heat from the oil and to keep the oil temperature within suitable limits, more particularly when the car is driven at lows vide the engine with an efiicient oil coo ing devige working independentlyof the engine s cc w in the'arrangement according to this invention the same fan serving forcooling the engine cylinders is caused to act on the-circulatmg oil and to cool this latter in a direct roportiontothe number of. turns of the g normal cooling through dispersion of heat from the casing.

For the a va purpose a'coil is arranged centrifugal pump employed for the forcedair circulation, said coil the pressure oil conduit, in such a we however, that it may be cut out at will t erefrom when so required by. weather conditions.

The accompanying grammatically and may of example a con structional form of invention.

Figure 1 is a the cooling arrangement applied to the fan 0 an air cooled engine.

Fi e 2 is a cross section through the fan cham r. I V

The centrifugal fan 1 arranged at the front drawing shows die-- longitudinel section showing duit 2. On the inner surface of the casing.

4 enclosing the fan 1 is arranged a coil 3 in which the oil delivered under pressure by the engine through. a suitable conduit is caused to circulate. 5 is the oil inlet (Fig. 2), and 6 is the outlet throu h which the 011 issues from the coil cooled y the fan, said coil bein cut out,when the atmospheric conditions s ould require it, through a conduit 8 by a cock 7 operated by hand or through a suitable thermostatic arrangement.

All the air blown by the fan flows alon the coil C, so that the. oil is efliciently cooled proportionally to the number of turns of the engine in a similar manner as in cylinder cooling.

What I claim is:

In combination with an internal combustion engine, a fan supplying coolin air to v said engine, a coil arranged in the an out-v let chamber and adapted to be put in the en- 

